A single pair of beams does not, however, produce a useful image. To do that requires scanning the object beam through the target about a hundred different ways. From the refractive index of each path it is possible with the application of some suitably crunchy computing power to produce a three-dimensional image.
To test his idea, Dr Feld looked at cervical-cancer cells. If you identify this cancer early, the patient will probably survive. Miss it, and she will die. Dr Feld wondered if the changes that occur during cancer would show up using his new method. They did, in a part of the cell called the nucleolus. This is the place where the components of protein factories are made. Since cancer cells grow rapidly, and thus have a high demand for proteins, it was a likely place to expect changes.
Dr Feld also has plans to use beams of different colours, since each colour has a slightly different refractive index in a given material. That would provide extra data for the computer to chew on, and probably result in better pictures. With enough pictures, Dr Felds technique may make biology as transparent as the cells it studies.
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